Assuming that most people have fairly stable lives they probably bought all their CDs some time in their 20s and maybe have to 1.25 cds a year to make up for wear and tear of their old music and the occasional new album.
For users with that kind of musical taste Streaming services are clearly a big increase in cost, offering no extra value.
For users with a wide ranging musical taste - which might be more applicable to younger generations who have been taught that access to all the world's music is a possibility - obviously the Streaming model is a superior value.
Or maybe it’s actually a net healthy thing—that is, demanding musical artists be lifelong paupers of the most fundamental degree—because music is an unproductive venture and starving artists make objectively better art.
I don't know the answer, but I'm a bit skeptical of the idea that small artists were making a better living via local CD shops (with limited inventory and zero economic incentive to push smaller, unknown artists).